Slip



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E. URNS EE' @AL SLIP Filed May '7, 1934 Patented Apr. 30, 1935 UNITEDSTATES PATENT OFFICE SLIP Application May 7, 1934, ASerial N0. 724,296

15 Claims.

This invention relates to! slips and relates more particularly to slipsfor arrangement in a rotary table bushing. It is a general object ofthis invention to provide improved rotary drill pipe slips havingeffective and readily replaceable pipe engaging liners.

Another object of the `invention is to provide a slip having two or moreliners for engaging the pipe and a simple dependable means for retainingthe removable liners in their proper operative positions.

Another object of the invention is to provide a slip of the charactermentioned in which the means for retaining the removable liners the bodyis simple and inexpensive and does not involve screws or similar parts.

Another object of the invention is to provide a rotary drill pipe slipof the character mentioned involving replaceable liners which cannotbecome wedged or tightly set in the body of the slip and, therefore, maybe easily and quickly replaced.

Another `object of the invention is to provide a slip of the charactermentioned in which a single plate is arranged in a groove in they bodyof the slip to hold the removable liners against displacement, whichplate is held in place by a simple, practical means which is notsubjected to any breaking strains `or forces.

A further object of the invention is to provide a slip of the charactermentioned that is light in weight and that is inexpensive ofmanufacture.

vOther objects and features of the invention will be better and morefully understood from the following detailed description of a typicalpreferred form and application of the invention, throughout whichdescription reference may be had to the accompanying drawing, in which:Fig. 1 is a plan elevation of a set of slips of the present inventionarranged in the master bushing of a rotary table. Fig. 2 is an enlargedlongitudinal detailed sectional view of one of theslips removed from themaster bushing. Figs. 3 and 4 are transverse detailed sectional viewstaken as indicated by lines 3-3 and 4 4, respectively, on Fig. 2 andFig. 5 is a fragmentary elevation view taken as indicated by line 5 5 onFig. 3.

The slips of the present invention are adapted to be arranged in themaster bushing of a rotary table to engage and support adrill pipeextending into the well. In the drawing we have illustrated a typicalmaster bushing I D arranged in the central opening II of a typicalrotary table I2. The bushing Il! has a central opening I3 withdownwardly and. inwardly inclined walls. In the typical assemblyillustrated in Fig, l of the drawing there are three like slips Sarranged intheopening I3 of the bushing I0. It is to be understood thatthe slips may be designed and proportionedA for vuse in sets of three ormore. As the several slips S may be identical We,V will proceed with aYdetailed description of a single slip, it being understood that suchdescription may apply equally well to the other slipsv of the series orset illustrated in Fig. 1.

'Ihe slip S includes, generally, a body I5 for arrangement in theopening of a master bushing, replaceable liners I 5 on the body forengaging the drill pipe P and means I'I for removably retaining theliners I6 on the body.

The body I5 is arcuate in its general plan coniiguration having curvedinner and outer sides and flat vertical sides I8. The inner surface orside I9 of the body I5 is vertical and is shaped or channeled to receivethe liners I5 as will be subsequently described. The outer side of thebody i5 has its major portion 20 inclined downwardly and inwardly to ton or cooperate with the wall of the bushing opening I I. The upperouter surface of the body I0 may be cylindrically curved about the sameaxis of curvature as the inner side I9. Where there are three slips Svarranged in the master bushing the body I5 is slightly less than extent.The opposite sides I8 of the body I5 may be parallel as illustrated inFigs. 3 and 4 of the drawing. Vertical and radial faces 2l are providedon the opposite sides of the body I5 to cooperate with the opposingcorresponding faces 2I on the adjacent slips. Horizontal wings 22 areprovided on the upper end of the body I5. The wings 22 project outwardlyadjacent the upper end of the body and their outer sides formcontinuations of the radial end faces 2l. The wings 22 facilitate theequal spacing of the slips S in the bushing opening I3. The wings 22extend only a short distance vertically of the body I5 and the body inbeing provided with the parallel sides I8 is light in weight. Inpractice the wings 22 may be spaced from the upper end of the body andmay have curved or inclined upper and lower ends as illustrated.

In accordance with the invention the body I5 is hollow or provided withan internal space or chamber 23. The' chamber the reduced lower end ofthe body I5 and one or more radialwebs 24 extend through the chamber toreinforce the body. The body I5 is being hollow as just described, islight in weight and easy to lift. A handle H is provided forfacilitating the lifting and handling of the slip. The top or upper endof the slip body I5 has a vertical shoulder 26 and two pairs of spacedlugs 2l project outwardly from this shoulder. The handle H includesspaced substantially parallel arms 23 whose ends are received betweenthe lugs 2T. A pin 29 extends through openings in the lugs 2'! and thearms 28 to pivotally attach the handle to the slip body. The handle Hhas a grip portion or head 30 projecting laterally from the outer endsof the arms 28. Downwardly curved members 3l connect the arms 28 withthe head 30 23 may be open atV to strengthen the handle structure. Themembers 3i project downwardly to form stops to space the handle abovethe surface of the rotary table I to facilitate the easy grasping andlifting of the handle.

The liners I6 are arranged'on the inner side i9 of the slip body I5 toengage and grip the drill pipe P and in accordance with the inventionare readily replaceable. of the invention illustrated inthe drawingthere are two spaced independent liners I5 on each slip body I5. Theliners I6 constitute the wear taking elements of the slip and arepreferably hardened. The two liners I6 of the slip S may be alike oridentical and are arranged in longitudinally extending grooves orchannels 32 in the curved inner side I9 of the body I5. The linercarrying channels 32 are preferably of uniform depth and widththroughout their lengths and have their inner walls concentric with theinner side I9 of the body. The Vertical side walls 33 cf the channels 32are radial with respect to the axis of curvature of the side IS and theinner walls of the channels. The two channels 3 2 are spaced a shortdistanceapart and are suitably spaced from the radial end faces 2l ofthe body.

The liners IE are shaped and proportioned to lit the channels 32 havingcurved inner sides for bearing againstA the curved inner walls of thechannels and having flat radial vertical ends 3ft for cooperating withthe end walls 33 of the channels. This cooperation of the radial ends 3dwith the walls 33 is in effect a dove-tailed fitting or engagement ofthe liners in the channelsA which opcrates to hold the liners-againstlateral or inward displacement from the channels. The liners I5 are ofuniform. thickness except for the gripping ribs or teeth 35 on theirexposed sides which project inwardly beyond the inner surfaces I9 of thebody. The teeth 35 extend circumferentially or horizontally and presentupwardly facing points or edges for engaging the drill pipe P. The lowerwalls of the channels 32 are formed by an upwardly facing shoulder 36.The shoulder 36 has its majorportion inclined upwardly and outwardly andthe lower ends of the liners it are correspondingly inclined tocooperate with this shoulder. It will be seen that the cooperation ofthe lower ends 3l' of the liners iii with the shoulder 3%* furtherretainsV the liners against displacement from the channels. In practicea transverse or circumferential groove 33 may be provided in the innerside I9 of the'body to facilitate the subsequent forming or cutting'ofthe channels 32 and to provide the inclined shoulder 36. The upper innercorner of the slip body I5 is cut back at the surface 3S Yto permit theliners IB to be slid or passed downwardly into the channels 32. vIt isbelieved that it will be apparent `how the liners It may be readilypassed downwardly or longitudinally into the channels 32 to positionswhere their lower ends 3l seat on the shoulder et.

rlihe means II for releasably locking or retaining the liners i6 againstdisplacement from the channels 32 includes a plate. iii) for cooperatingwith the upper ends of the liners. A circumferentially extending recessor groove d! of rectangular cross section is provided in the inner sideof the slip body I5 at the lower end of the surface 39 to receive theretaining plate fit. The plate il is arcuate in plan elevation and mayhave its radial ends at or adjacent the radial ends of the wings 22. Theplate lill ts the groove @I with suitable clearance and its lower sideis adapted to cooperate with the upper ends of the In the preferred formliners I5 to prevent the liners from passing upwardly or longitudinallyfrom the channels 32. As clearly illustrated in Fig. 5 of the drawingthe curved exposed edge of the liner retaining plate e!! is spacedinwardly with respect to the teeth 35 so that it does not contact withthe drill pipe P.

A central rearwardly projecting tongue d2 is provided on the plate 6E!and extends through an opening 3 in the body I5. The opening 43 extendsfrom the groove 4i to a vertical notch 44 in the shoulder 2S. The tonguel2 is cylindrical and projects into the notch 44. The opening 43 is ofround cross section and intersects the upper wall of the slot ffii toreadily receive the cylindrical tongue. A transverse or vertical opening45 is provided in the tongue d2 to receive a cotter key de. The cotterkey 116 cooperates with the wall of the notch @4to lock the plate liagainst displacement from the groove L be entirely received within thenotch 44 so that it is not liable to injury or displacement. The plateis held in the groove `4I and cooperates with the upper ends of theslips I6 to positively prevent upward shifting or displacement of theliners it. The cotter key 46 in turn prevents unintentional shifting ordisplacement of the plate di). The upper end of the cotter key 46 isreadily engageable from the upper end of the slip body l5 whereby theplate 40 and liners I6 may be readily removed from the body. f

It is believed that the utility and practicability of they slipsprovided by this invention will be readily apparent from the foregoingdetailed description. As illustrated in Fig. l of the drawing the set'or plurality of slips S is arranged in the opening I3 ofthe masterbushing I0 to engage or grip the drill pipe P. The teeth 35 of theliners i6 project from the curved inner sides of the slip bodies toeffectively contact and grip the pipe. The slip bodies I5 in being madehollow as above described, and in having the parallel sides |85 arelight in weight so that the slips are easy to handle. The wings 22insure the proper spacing of the set of slips about the pipe P but donot materially increase the weight of the slips. tion of the flat radialends 34 of the liners I6 with the vertical walls 33 of the channels 32hold the liners against outward or forward displacement from thechannels. The shoulder 36 limits the downward movement of the liners andaids in retaining the liners. The plate 40 is held against upwardmovement through its cooperation with the groove 4I and cooperates withthe upper ends of the liners to prevent upward or longitudinaldisplacement of the liners fromv the channels. The cotter keys Q6 whichremovably hold the plates d against displacement are not subjected toany severe usage. The cotter keys i6 are easily engageable and removableto allow theplates 4B to be withdrawn forwardly out of the groovesl 4 I.The liner assembly and the linerretaining means The key 46 may:

The cooperav of the invention are simple and dependable and areinexpensive of manufacture.

Having described only a typical form and application of our invention,we do not wish to limit ourselves to the specific details set forth, butwish to reserve to ourselves any changes or variations that may appearto those skilled in the art or that fall within the scope of thefollowing claims:

Having described our invention, we claimt" A LA slip of the characterdescribed including a body having spaced longitudinal channels in-.itsinner side, a liner in each of the channels engaging the side wallsthereof to be held against lateral displacement therefrom, and a singlemeans removably securing the liners in the channels.

2. A slip of the character described including a body having spacedlongitudinal channels, a removable liner in each of the channelscooperating with the walls thereof to be held against outwarddisplacement therefrom, and a detachable plate holding the linersagainst longitudinal displacement from the channels.

3. In a slip of the character described, a body having spacedlongitudinal channels, a removable liner in each channel cooperatingwith the walls thereof to be held against outward displacement andlongitudinal displacement in one direction, and a detachable plateholding the liners against longitudinal displacement from the channelsin the other direction.

v 4. In a slip of the character described, a body having spacedlongitudinal channels and a transverse groove, a removable liner in eachchannel cooperating with the walls thereof to be held against outwarddisplacement and longitudinal displacement in one direction, and aremovable plate in the groove for holding the liners againstlongitudinal displacement in the other direction.

5. In a slip of the character described, a body having spacedlongitudinal channels and a groove intersecting the upper portions ofthe channels, a removable liner in each channel cooperating with thewalls thereof to be held against outward displacement and downwarddisplacement, a plate in the groove for preventing upward displacementof the liners, and means for removably retaining the plate in thegroove. c

6. In a slip of the character described, a body having spacedlongitudinal channels adapted to retain removable liners against outwarddisplacement and downward displacement and having a groove intersectingthe upper portions of the channels, a removable plate in the groove forpreventing upward displacement of the liners, a tongue on the plateextending through an opening in the body, and a removable key on thetongue for holding the plate in the groove.

7. A slip of the character described including a body having a channelin its inner side, a transverse groove in said side intersecting theupper portion of the channel and an outwardly extending opening joiningthe groove, a liner in the channel retained against outward and downwarddisplacement therefrom through contact with its walls, a removable platein the groove for preventing upward displacement of the liner, a tongueon the plate projecting through said opening, and a removable key on thetongue cooperating with the body to retain the plate in the groove.

8. A slip including an arcuate body having a longitudinal channel in itsinner side and a transverse groove in its inner side intersecting theupper portion of the channel, the channel having radial side walls, aliner in the channel, the liner having radial sides cooperating withsaid walls whereby it is held against outward displacement, a removableplate in the groove retaining the liner in the channel, and removablemeans for holding the plate in the groove.

9. A slip including an arcuate body having spaced longitudinal channelsin its inner side with radialside wallsand having a groove intersectingthe channels and an opening joining the groove, removable liners in thechannels having radial sides cooperating with said radial walls wherebythey are held against outward displacement from the channels, aremovable plate in the groove preventing longitudinal displacement ofthe liners, a tongue on the plate extending through said opening, and aremovable key on the tongue retaining the plate in the groove.

10. In a slip of the character described a body for arrangement in theopening of a rotary table, the body having a curved convex outer surfacefor seating in the opening, a curved concave inner surface for carryingpipe engaging means, substantially parallel opposite sides, and radialsurfaces on said sides adjacent the inner surface for cooperating withadjacent slips.

11. A slip including an arcuate body having spaced longitudinal channelsin its inner side with radial side walls and having a grooveintersecting the channels and an opening joining the groove, removableliners in the channels having radial sides cooperating with said radialwalls whereby they are held against outward displacement from thechannels, a removable plate in the groove preventing longitudinaldisplacement of the liners, a tongue on the plate extending through saidopening, the body having an open recess into which the end portion ofthe tongue projects, and a removable key arranged in an opening in saidportion of the tongue and adapted to cooperate with the walll of therecess t hold the plate in the groove.

l2. In a slip of the character described a body for arrangement in theopening of a rotary table, the body having a curved convex outer surfacefor seating in the opening, a curved concave inner surface for carryingpipe engaging means, substantially parallel opposite sides, and wingsprojecting from the said opposite sides and having surfaces forcooperating with the corresponding surfaces of adjacent slips.

13. In a slip of the character described a body for arrangement in theopening of a rotary table, the body having a curved convex outer surfacefor seating in the opening, a curved concave inner surface for carryingpipe engaging means, substantially parallel opposite sides, and wingsprojecting from the said opposite sides and having surfaces forcooperating with the corresponding surfaces of adjacent slips, the wingsbeing of relatively small extent longitudinally of the body.

14. In a slip of the character described, a body having a channel in itsinner side, and a transverse groove adjacent its upper end intersectingthe channel, a removable liner in the channel held against lateraldisplacement therefrom through cooperation with its walls, anda plate inthe groove preventing longitudinal displacement of the liner from thechannel.

15. In a slip of the character described, a body for arrangement in theopening of a rotary table, the body having an outer surface for seatingin the opening of the table and having pipe engaging means on its innersurface, the opposite sides of the body being substantially parallel,and wings projecting from the said opposite sides and having surfacesfor cooperating with the corresponding surfaces of adjacent slips.

ERWIN BURNS. HARRY P. WICKERSHAM.

